Photomicrographic-plate holder.



No. 670,842. Patented Mar. 26, I91. N. A. COBB.

PHUTOMICRDGRAPHIC PLATE HOLDER.

Application filed Sept. 18, 1899.)

(No Model.)

Nrrnn STATES PATENT FFICE.

NATHAN A. COBB, O1 SYDNEY, NEW SOUTH ALES.

PHOTOMICROGRAPHEC-PLATE HOLDER;

SPECIFICATION forming part of Letters Patent N 0. 670,842, dated March 26, 1901.

Application filed September 18, 1899. Serial No. 730,790. (No model.)

To all whomit may concern:

Be it known thatI, NATHAN A. COBB, a citizen of the United States, residing at Sydney, in the county of Cumberland, New South Wales, have inventeda new and useful Photographic-Plate Holder for Microscopes, of which the following is a specification.

The object of my present invention is to provide alight, eflicient, and inexpensive attachment which may be applied to the tube of a microscope, so that the microscope may be first focused and a photograph thereafter taken, as will be hereinafter described.

To this end my invention consists of the photographic-plate holder and the combinations thereofwith the tube of the microscope, as hereinafter described, and more particularly pointed out in the claim at the end of this specification.

In the accompanying drawings, Figure 1 is perspective view of a plateholder as the same is applied to a microscope-tube. Fig. 2 is a detail view of the end block or piece, and Fig. 3 is a detail broken-away view showing the cover of the plate-holder opened.

A plate-holder for microscopes constructed according to my invention comprises a tapering body portion having a socket at one end for fitting onto a microscope-tube and haviug a cover at its opposite end which may be opened for the insertion and removal of the desired plate.

To form a light-tight joint between the cover and the upper frame of the plate-holder, I preferably line these parts with velvet, and the tapering body portion of the plate-holder may also be lined with velvet or other darkcoloned material.

Referring to the drawings and in detail, my plate-holder as herein illustrated comprises a tapering body portion 10. The body portion 10 maybe made of pasteboard or similar lightinexpensive material and may be formed in the shape of a frustum ot' a pyramid or cone. Securedin the lower end of the body portion 10 is an end piece or block 11. The end piece or block is provided with a central socket for engaging the tube of a microscope, as 12, and mounted in the block 11 and extending through the tapering body portion 10' is a slide 13. At its upper end the body portion 10 is provided with a top casing 14:, and

fitting thereto and preferably hinged is a cover 15. The casing 14: and cover 15 are lined,preferably, with velvet, so that when the cover is shut down, as shown in Fig. 1, the cover will make a preferably light-tight joint with the casing 14. To hold down the cover 15, I may employ an elastic band, as 16, which may be held in place by hooks 17.

A photographic plate may be inserted in the end casing 14 and will be supported by lugs or blocks 18 therein, and the body portion of the plate-holder may be lined with velvet or other dark material.

In the use of a plate-holder as thus constructed a focusing screen or plate may first be put into the plate-holder and the microscope focused, so that an image will be formed substantially in the plane of the plate. The plate-holder may then be taken to the dark room and a photographic or sensitive plate substituted for the focusing-plate. The plateholder may then be replaced on the tube of the microscope and the slide 13 opened and left open to make the desired exposure.

In some cases, in order to adapt the plateholder to niiscroscope tubes which differ somewhat in diameter, the end piece 11 may be provided with set-screws, as 20, so that the plate-holder may be securely fastened to the tube, if desired.

By means of this construction it will be seen that I have provided an extremely light, simple, and inexpensive plate-holder for microscopes by means of which microscope photographs may be taken in a simple and inexpensive manner.

I am aware that many changes maybe made in the construction of my plate-holder by those who are skilled in the art, and I do not wish, therefore, to be limited to the form or proportions which I have herein shown and described; but

What I do claim, and desire to secure by Letters Patent of the United States, is-

As an article of manufacture, a plate-holder adapted to be directly connected to a microscope-tube, comprising atapering body portion 10, asocket-piece 11 secured in thelower end thereof, and having asocket for engaging the tube of a microscope, a slide 13 mounted in the socket-piece 11, a casing 1 1 at the upper end of the body portion, said casing having supporting-ledges for directly and intermy hand in the presence of two subscribing changeably supporting a focusing-screen or Witnesses.

photographieplates a hin ed cover 15 a plum )4 rality of hooks 17, 25nd an elastie band 16 for NAHIAN Cobb 5 engaging said hooks to hold the cover shut, Witnesses:

LOUIS W. SOUTHGATE,

substantially as described.

In testimony whereof I have hereunto set PHILIP V. SOU'LI-IGATE. 

